Seiko 7005a

[LonglineOjoe 7]

Hi all, this is a question born of distraction and I’m sure it’ll get me some interesting replies. 

is it just me or does anyone else have a problem lining up the escape wheel with the B&T bridge?  I’ve taken apart and (mostly) reassembled 6138’s and 6139’s and not had much issue. I thought, naively, that the 7005a would be a straightforward strip and rebuild to practice on but I’m continually stumped!  When I’ve finally got the escape properly seated, the rest of the gears refuse to move. Maybe I have too much time on my hands. 

[Nucejoe 1,327]

What does B&T stand for.

[saswatch88 156]

1 hour ago, LonglineOjoe said:

Hi all, this is a question born of distraction and I’m sure it’ll get me some interesting replies. 

is it just me or does anyone else have a problem lining up the escape wheel with the B&T bridge?  I’ve taken apart and (mostly) reassembled 6138’s and 6139’s and not had much issue. I thought, naively, that the 7005a would be a straightforward strip and rebuild to practice on but I’m continually stumped!  When I’ve finally got the escape properly seated, the rest of the gears refuse to move. Maybe I have too much time on my hands. 

maybe the jewel is cracked. Never had any issues like this on any seiko 7xxx movements.

[Melt 37]

I would add the gears in one at a time to see which one is jamming the gear train. 

The mainspring can also bind. Check for wear. And as above inspect all jewels.

This should be easy after a 6138 rebuild!

Good Luck.

[watchweasol 1,326]

The seiko 7 series are usually straight forward.  Assemble it bit by bit testing at each stage, Barrel, the train, check. escapement wheel, check. fork/pallet, check action with one turn on the spring is it snappy  if so add the balance.  the thing is check the freedom of rotation at each stage.   You might find the attached sheet handy

Seiko 7005A.pdf

[watchweasol 1,326]

Hi Joe    I guess barrel and train  ?

[LonglineOjoe 7]

Yes, I am getting lazy!:)

[Nucejoe 1,327]

1 hour ago, watchweasol said:

Hi Joe    I guess barrel and train  ?

Thanks man, you are a jewel.

[watchweasol 1,326]

Hi  I have attached the PDF again The previous one was us so tried again.

Seiko 7005A.pdf

[LonglineOjoe 7]

Thanks!!!